By default, the sandbag comes fully filled with 3 filler bags that hits the maximum weight without any loose sand. If you would like the weight to be lighter, simply take out one filler bag! This is unlike other sandbags on the market which sells you more expensive sandbags which come empty! Why use sandbags? Here are the best reasons! Multiple exercises from standing in one position. Portable Space efficient Single / multi joint movements all possible with one tool Beginners and Pros will both feel challenged Best used in combination with other tools like kettlebells, medicine balls Conditioning tool for athletes, martial artists, military, firefighters and so forth.